Madison County Travel Demand Model Challenges and Innovations Diane B. Zimmerman, PE

Location Map

Madison County Base Year 2000 Base Year 2000 –2000 Population = 70,872 –2000 Employment = 36,200 Future Year 2025 Future Year 2025 –2025 Population =105,000 –2025 Employment = 57,000

TAZ Map Combined the areas from the previous Richmond and Berea Models Combined the areas from the previous Richmond and Berea Models 176 Internal Zones 176 Internal Zones 16 External Stations 16 External Stations

Richmond and Berea

Highway Network Imported from KY GIS coverage the Traffic Flow layer Imported from KY GIS coverage the Traffic Flow layer Added the Federal Functional Class Layer Added the Federal Functional Class Layer Added the Local Layer Added the Local Layer Traced Interstates and ramps from the DOQQ Traced Interstates and ramps from the DOQQ

Highway Network Coded signal locations Coded signal locations Coded g/c ratios from sketch planning of signal timing Coded g/c ratios from sketch planning of signal timing Capacity was computed link by link rather than by area/facility by TransCAD using procedures from NCHRP Capacity was computed link by link rather than by area/facility by TransCAD using procedures from NCHRP Default properties were by area, then location specific data was added Default properties were by area, then location specific data was added

Trip Generation Population Data from Census Block data Population Data from Census Block data Employment Data from Employment Services, supplemented by phone calls to non-profit organizations and missing employers Employment Data from Employment Services, supplemented by phone calls to non-profit organizations and missing employers NCHRP 365 procedures were used NCHRP 365 procedures were used E-I trips were converted to Productions at the External stations and Attractions to Internal zones E-I trips were converted to Productions at the External stations and Attractions to Internal zones Student Trip rates were initially taken from the Lexington study and increased during calibration Student Trip rates were initially taken from the Lexington study and increased during calibration A separate trip rate was used for Urban and Rural zones to reflect trip chaining in the urban areas A separate trip rate was used for Urban and Rural zones to reflect trip chaining in the urban areas

Challenges Two distinct small urban areas Two distinct small urban areas Two Universities – Eastern Kentucky University and Berea College Two Universities – Eastern Kentucky University and Berea College Interstate 75 Interstate 75 Army munitions base Army munitions base Major improvement to KY 52 west Major improvement to KY 52 west New interchange on I-75 New interchange on I-75

Innovations User Interface User Interface –Allows user to exactly replicate run made by JJG, similar to the MINUTP 00.bat file –Changes are made to the GISDK code or to the input files

User Interface

Calibration Results Overall RMSE = 26.0% Overall RMSE = 26.0% VMT Difference = -0.9% VMT Difference = -0.9% –Urban -5.3% –Rural 2.8%

RMSE Comparison

VMT Comparison

Special Thanks to Nick Uhren for all his work!